package com.itemwaimai.reggin.filter;

import com.alibaba.fastjson.JSON;
import com.itemwaimai.reggin.common.BaseContext;
import com.itemwaimai.reggin.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileFilter;
import java.io.IOException;

/**
 * 过滤器
 * 检查用户是否已经完成登录
 * */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路劲匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER =new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest,
                         ServletResponse servletResponse,
                         FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        HttpServletRequest request = (HttpServletRequest) servletRequest;

        //1获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截请求：{}",requestURI);
        //定义不需要的请求路径
        String[] urls =new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        //2判断本次请求是否要处理
        boolean check = check(urls,requestURI);
        //3如果不需要请求直接放行
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1判断登录状态,如果已登录，则直接放行
        if (request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户的id为{}",request.getSession().getAttribute("employee"));
            //存储在线程中
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            //使用线程测试线程
//            Long id = Thread.currentThread().getId();
//            log.info("线程id为：{}",id);

            filterChain.doFilter(request,response);
            return;
        }

        //4-2判断登录状态,如果已登录，则直接放行（移动端）
        if (request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户的id为{}",request.getSession().getAttribute("user"));
            //存储在线程中
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            //使用线程测试线程
//            Long id = Thread.currentThread().getId();
//            log.info("线程id为：{}",id);
            //放行
            filterChain.doFilter(request,response);
            return;
        }


        log.info("用户未登录");
        //5如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

        return;


    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url: urls){
            boolean match = PATH_MATCHER.match(url,requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
